Review of Field Weakening Control Strategies of Permanent Magnet Synchronous Motors

Due to high power density, high efficiency, and accurate control performance, permanent magnet synchronous motors (PMSMs) have been widely adopted in equipment manufacturing and energy transformation fields. To expand the speed range under finite DC-bus voltage, extensive research on field weakening (FW) control strategies has been conducted. This paper summarizes the major FW control strategies of PMSMs, which are categorized into calculation-based methods, voltage closed-loop control methods, and model predictive control related methods. The existing strategies are analyzed and compared according to performance, robustness, and execution difficulty, which can facilitate the implementation of FW control.